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Manufacturing PLA/PCL Blends by Ultrasonic Molding Technology.

Inés Ferrer¹, Ariadna Manresa¹, José Alberto Méndez²

¹Departament d'Enginyeria Mecànica i de la Construcció Industrial, EPS-Universitat de Girona, c/M. Aurèlia Capmany, 61-17003 Girona, Spain.

|August 10, 2021

Summary

This summary is machine-generated.

Ultrasonic molding (USM) successfully processed polylactic acid/polylactic acid (PLA/PCL) blends, showing minimal impact on thermal properties but altering crystallinity. Molecular weight increased, and degradation followed expected trends, validating USM for polymer blend applications.

Keywords:

bioabsorbable polymers biodegradable polymers polymeric blends ultrasonic molding ultrasonic plasticizing

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Area of Science:

Materials Science and Engineering
Polymer Processing
Composite Materials

Background:

Ultrasonic molding (USM) offers advantages for studying polymer mixtures due to low material requirements, minimal waste, and reduced pressure/residence time.
Investigating the processability of polylactic acid/polycaprolactone (PLA/PCL) blends using USM is novel, covering the entire production chain from raw material to final specimen.

Purpose of the Study:

To evaluate the capability of ultrasonic molding (USM) technology for processing PLA/PCL blends and their neat counterparts.
To analyze the effects of USM on the thermal properties, crystallinity, molecular weight, and degradation of PLA/PCL blends.
To understand the influence of pellet characteristics and blend composition on USM process parameters.

Main Methods:

Processing of PLA/PCL blends and neat materials using ultrasonic molding (USM).
Characterization of thermal properties, crystallinity degree, molecular weight, and degradation behavior of the processed specimens.
Analysis of the impact of pellet shape, dimensions, and blend composition on USM process parameters.

Main Results:

USM processing did not significantly affect the thermal properties of PLA/PCL blends.
Crystallinity degree varied, decreasing in PLA and increasing in PCL, attributed to crystallization rates, high process speed, short cooling, and small particle size.
Ultrasonic energy led to a slight increase in molecular weight, with degradation results aligning with expected trends for these blends.

Conclusions:

Ultrasonic molding (USM) is a suitable technology for processing PLA/PCL blends.
Successful processing requires careful determination of process parameter windows.
Pellet characteristics and blend composition significantly influence USM process parameters.